I've updated to the new V6.1608 release on the Heli-X website and want to report a couple of things I've noticed so far. I'm using V6 on my 27 inch Retina iMac running OS X 10.10.2 (Yosemite).

There is a zoom/panning glitch when running in Full Screen mode. What happens is that it "zooms in" briefly as I pass through a region in space and then zooms back to the original setting. If I hover within that region it stays zoomed, but I can't see the helicopter until I either climb above that region, or descend below it again. It only happens in full screen mode, and windowed mode doesn't have the same issue. It appears to be related to the camera elevations angle as it follows the heli.

Also, the "Hide mouse" and "Deactivate screen saver" check boxes under Global Settings: Miscellaneous have no effect as the mouse is always showing and screen saver activates whether the boxes are checked or not.